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Project: Computing novel functions in low-dimensional systems
Summary
The aim of this project is to make progress in the
understanding of new quantum phenomena, especially related to
magnetism, occuring in low dimensional systems: surfaces, atomic
and molecular films and nanoparticles, by bringing together experimentalists,
theorists and computer scienctists of the Graduate School of Advanced
Integration Science at Chiba University and external collaborators.
Background:
Various phenomena in low-dimensional dimensional systems have been discovered
in recent decades including
(i) spin-polarization at surfaces in macroscopically non-magnetic systems
through reduced dimensionality and symmetry breaking (esp. topological
insulators),
(ii) spin-filtering and/or spin-reversal at the interface of organic molecules
and ferromagnetic substrates,
(iii) metal-insulator-transition and superconductivity in layered compounds,
(iv) electron confinement in nanoparticles.
It is expected that these phenomena will lead to novel applications
in spintronics and improved devices for magnetic information storage
in the near future.
It is therefore important to understand the low-dimensional
phenomena, and to find out how to tune their properties,
by investigating the influence of various parameters such
as substrate, size, and doping level (defects or adsorbed chemical species).
The projects' particular point is that experimentalists,
theorists, and computer scientists, work together and
combine experiment, modeling and high-performance computing.
The project members at Chiba University have made important
contributions to the study of these novel phenomena.
Also, they have highly complementary expertise in the atomic scale probes
required for the observation
and manipulation of these effects, namely scanning tunning microscopy,
angle-resolved photoemission, and x-ray absorption spectrocopy, as well as
theoretical modeling.
The electronic and magnetic state of adsorbed molecules
on two types of substrates will be investigated:
ferromagnetic metals (Fe, Co) as well as topological insulators (Bi2Se3).
The electronic and magnetic structure will be studied using a combination of
STM, ARPES, NEXAFS and first principles calculations.
Emphasis is put on the character of the charge and spin carriers.